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1 | package Mouse::Meta::TypeConstraint; |
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2 | use Mouse::Util qw(:meta); # enables strict and warnings |
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3 | |
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4 | use overload |
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5 | 'bool' => sub { 1 }, # always true |
6 | |
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7 | '""' => sub { $_[0]->name }, # stringify to tc name |
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8 | |
9 | '|' => sub { # or-combination |
10 | require Mouse::Util::TypeConstraints; |
11 | return Mouse::Util::TypeConstraints::find_or_parse_type_constraint( |
12 | "$_[0] | $_[1]", |
13 | ); |
14 | }, |
15 | |
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16 | fallback => 1; |
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17 | |
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18 | use Carp (); |
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19 | |
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20 | sub new { |
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21 | my($class, %args) = @_; |
22 | |
23 | $args{name} = '__ANON__' if !defined $args{name}; |
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24 | |
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25 | my $check = delete $args{optimized}; |
26 | |
27 | if($args{_compiled_type_constraint}){ |
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28 | Carp::cluck("'_compiled_type_constraint' has been deprecated, use 'optimized' instead") |
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29 | if Mouse::Util::_MOUSE_VERBOSE; |
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30 | |
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31 | $check = $args{_compiled_type_constraint}; |
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32 | } |
33 | |
34 | if($check){ |
35 | $args{hand_optimized_type_constraint} = $check; |
36 | $args{compiled_type_constraint} = $check; |
37 | } |
38 | |
39 | $check = $args{constraint}; |
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40 | |
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41 | if(defined($check) && ref($check) ne 'CODE'){ |
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42 | Carp::confess("Constraint for $args{name} is not a CODE reference"); |
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43 | } |
44 | |
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45 | $args{package_defined_in} ||= caller; |
46 | |
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47 | my $self = bless \%args, $class; |
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48 | $self->compile_type_constraint() if !$self->{hand_optimized_type_constraint}; |
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49 | |
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50 | if($self->{type_constraints}){ # Union |
51 | my @coercions; |
52 | foreach my $type(@{$self->{type_constraints}}){ |
53 | if($type->has_coercion){ |
54 | push @coercions, $type; |
55 | } |
56 | } |
57 | if(@coercions){ |
58 | $self->{_compiled_type_coercion} = sub { |
59 | my($thing) = @_; |
60 | foreach my $type(@coercions){ |
61 | my $value = $type->coerce($thing); |
62 | return $value if $self->check($value); |
63 | } |
64 | return $thing; |
65 | }; |
66 | } |
67 | } |
68 | |
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69 | return $self; |
70 | } |
71 | |
72 | sub create_child_type{ |
73 | my $self = shift; |
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74 | # XXX: FIXME |
75 | return ref($self)->new( |
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76 | # a child inherits its parent's attributes |
77 | %{$self}, |
78 | |
79 | # but does not inherit 'compiled_type_constraint' and 'hand_optimized_type_constraint' |
80 | compiled_type_constraint => undef, |
81 | hand_optimized_type_constraint => undef, |
82 | |
83 | # and is given child-specific args, of course. |
84 | @_, |
85 | |
86 | # and its parent |
87 | parent => $self, |
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88 | ); |
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89 | } |
90 | |
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91 | sub _add_type_coercions{ |
92 | my $self = shift; |
93 | |
94 | my $coercions = ($self->{_coercion_map} ||= []); |
95 | my %has = map{ $_->[0] => undef } @{$coercions}; |
96 | |
97 | for(my $i = 0; $i < @_; $i++){ |
98 | my $from = $_[ $i]; |
99 | my $action = $_[++$i]; |
100 | |
101 | if(exists $has{$from}){ |
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102 | Carp::confess("A coercion action already exists for '$from'"); |
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103 | } |
104 | |
105 | my $type = Mouse::Util::TypeConstraints::find_or_parse_type_constraint($from) |
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106 | or Carp::confess("Could not find the type constraint ($from) to coerce from"); |
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107 | |
108 | push @{$coercions}, [ $type => $action ]; |
109 | } |
110 | |
111 | # compile |
112 | if(exists $self->{type_constraints}){ # union type |
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113 | Carp::confess("Cannot add additional type coercions to Union types"); |
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114 | } |
115 | else{ |
116 | $self->{_compiled_type_coercion} = sub { |
117 | my($thing) = @_;\r |
118 | foreach my $pair (@{$coercions}) {\r |
119 | #my ($constraint, $converter) = @$pair;\r |
120 | if ($pair->[0]->check($thing)) {\r |
121 | local $_ = $thing; |
122 | return $pair->[1]->($thing); |
123 | }\r |
124 | }\r |
125 | return $thing;\r |
126 | }; |
127 | } |
128 | return; |
129 | } |
130 | |
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131 | sub check { |
132 | my $self = shift; |
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133 | return $self->_compiled_type_constraint->(@_); |
134 | } |
135 | |
136 | sub coerce { |
137 | my $self = shift; |
ffbbf459 |
138 | |
139 | return $_[0] if $self->_compiled_type_constraint->(@_); |
140 | |
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141 | my $coercion = $self->_compiled_type_coercion; |
142 | return $coercion ? $coercion->(@_) : $_[0]; |
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143 | } |
144 | |
145 | sub get_message { |
146 | my ($self, $value) = @_; |
147 | if ( my $msg = $self->message ) { |
148 | local $_ = $value; |
149 | return $msg->($value); |
150 | } |
151 | else { |
152 | $value = ( defined $value ? overload::StrVal($value) : 'undef' ); |
153 | return "Validation failed for '$self' failed with value $value"; |
154 | } |
155 | } |
156 | |
157 | sub is_a_type_of{ |
158 | my($self, $other) = @_; |
159 | |
160 | # ->is_a_type_of('__ANON__') is always false |
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161 | return 0 if !ref($other) && $other eq '__ANON__'; |
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162 | |
163 | (my $other_name = $other) =~ s/\s+//g; |
164 | |
165 | return 1 if $self->name eq $other_name; |
166 | |
167 | if(exists $self->{type_constraints}){ # union |
168 | foreach my $type(@{$self->{type_constraints}}){ |
169 | return 1 if $type->name eq $other_name; |
170 | } |
171 | } |
172 | |
173 | for(my $parent = $self->parent; defined $parent; $parent = $parent->parent){ |
174 | return 1 if $parent->name eq $other_name; |
175 | } |
176 | |
177 | return 0; |
178 | } |
179 | |
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180 | # See also Moose::Meta::TypeConstraint::Parameterizable |
181 | sub parameterize{ |
182 | my($self, $param, $name) = @_; |
183 | |
184 | if(!ref $param){ |
185 | require Mouse::Util::TypeConstraints; |
186 | $param = Mouse::Util::TypeConstraints::find_or_create_isa_type_constraint($param); |
187 | } |
188 | |
189 | $name ||= sprintf '%s[%s]', $self->name, $param->name; |
190 | |
191 | my $generator = $self->{constraint_generator} |
192 | || Carp::confess("The $name constraint cannot be used, because $param doesn't subtype from a parameterizable type"); |
193 | |
194 | return Mouse::Meta::TypeConstraint->new( |
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195 | name => $name, |
196 | parent => $self, |
197 | parameter => $param, |
198 | constraint => $generator->($param), # must be 'constraint', not 'optimized' |
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199 | |
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200 | type => 'Parameterized', |
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201 | ); |
202 | } |
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203 | |
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204 | 1; |
205 | __END__ |
206 | |
207 | =head1 NAME |
208 | |
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209 | Mouse::Meta::TypeConstraint - The Mouse Type Constraint metaclass |
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210 | |
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211 | =head1 VERSION |
212 | |
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213 | This document describes Mouse version 0.41 |
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214 | |
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215 | =head1 DESCRIPTION |
216 | |
217 | For the most part, the only time you will ever encounter an |
218 | instance of this class is if you are doing some serious deep |
219 | introspection. This API should not be considered final, but |
220 | it is B<highly unlikely> that this will matter to a regular |
221 | Mouse user. |
222 | |
223 | Don't use this. |
224 | |
225 | =head1 METHODS |
226 | |
227 | =over 4 |
228 | |
229 | =item B<new> |
230 | |
231 | =item B<name> |
232 | |
233 | =back |
234 | |
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235 | =head1 SEE ALSO |
236 | |
237 | L<Moose::Meta::TypeConstraint> |
238 | |
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239 | =cut |
240 | |